A process for the preparation of sulfur-containing N-benzyl-amino acids of the formula ##STR1## wherein X and Y, which may be identical to or different from each other, are each hydrogen or halogen; R.sub.1 is hydrogen or alkyl of 1 to 4 carbon atoms; R.sub.2 is hydrogen, alkyl of 1 to 3 carbon atoms, carboxy-lower alkyl or acyl; R.sub.3 is hydrogen or acyl; and n is 1 or 2; which comprises the steps of converting anthranilic acid or a halogenated anthranilic acid into the corresponding aldehyde, reacting the aldehyde with a compound of the formula ##STR2## wherein R.sub.1, R.sub.2 and n have the meanings previously defined, to form the corresponding Schiff's base, reducing the said Schiff's base, and recovering the reaction product.
一种制备含
硫N-苄基
氨基酸的方法,其
化学式为##STR1##其中X和Y可以相同也可以不同,均为氢或卤素;R.sub.1为氢或1至4个碳原子的烷基;R.sub.2为氢、1至3个碳原子的烷基、羧基-低烷基或酰基;R.sub.3为氢或酰基;n为1或2;包括以下步骤:将
蒽酸或卤代
蒽酸转化为相应的醛,将醛与化合物##STR2##反应,其中R.sub.1、R.sub.2和n的含义如前所定义,形成相应的Schiff碱基,还原所述Schiff碱基,并回收反应产物。